/*
 * Licensed under the GNU Lesser General Public License Version 3
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the license, or
 * (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

// generated automatically - do not change


module glib.Idle;

private import gi.glib;
public  import gi.glibtypes;
private import glib.Source;


/** */
public class Idle
{
	/** Holds all idle delegates */
	bool delegate()[] idleListeners;
	/** our idle ID */
	uint idleID;
	
	/**
	 * Creates a new idle cycle.
	 * Params:
	 *    	interval = the idle in milieconds
	 *    	dlg = the delegate to be executed
	 *    	fireNow = When true the delegate will be executed emmidiatly
	 */
	this(bool delegate() dlg, bool fireNow=false)
	{
		idleListeners ~= dlg;
		idleID = g_idle_add(cast(GSourceFunc)&idleCallback, cast(void*)this);
		if ( fireNow )
		{
			if ( !dlg() )
			{
				idleListeners.length = 0;
			}
		}
	}
	
	/**
	 * Creates a new idle cycle.
	 * Params:
	 *    	dlg = the delegate to be executed
	 *      priority = Priority for the idle function
	 *    	fireNow = When true the delegate will be executed emmidiatly
	 */
	this(bool delegate() dlg, GPriority priority, bool fireNow=false)
	{
		idleListeners ~= dlg;
		idleID = g_idle_add_full(priority, cast(GSourceFunc)&idleCallback, cast(void*)this, null);
		if ( fireNow )
		{
			if ( !dlg() )
			{
				idleListeners.length = 0;
			}
		}
	}
	
	/** */
	public void stop()
	{
		if ( idleID > 0 )
		{
			g_source_remove(idleID);
		}
		idleListeners.length = 0;
	}
	
	/**
	 * Removes the idle from gtk
	 */
	~this()
	{
		stop();
	}
	
	/**
	 * Adds a new delegate to this idle cycle
	 * Params:
	 *    	dlg =
	 *    	fireNow =
	 */
	public void addListener(bool delegate() dlg, bool fireNow=false)
	{
		idleListeners ~= dlg;
		if ( fireNow )
		{
			if ( !dlg() )
			{
				idleListeners.length = idleListeners.length - 1;
			}
		}
	}
	
	/**
	 * The callback execution from glib
	 * Params:
	 *    	idle =
	 * Returns:
	 */
	extern(C) static bool idleCallback(Idle idle)
	{
		return idle.callAllListeners();
	}
	
	/**
	 * Executes all delegates on the execution list
	 * Returns:
	 */
	private bool callAllListeners()
	{
		bool runAgain = false;
		
		int i = 0;
		
		while ( i<idleListeners.length )
		{
			if ( !idleListeners[i]() )
			{
				idleListeners = idleListeners[0..i] ~ idleListeners[i+1..idleListeners.length];
			}
			else
			{
				runAgain = true;
				++i;
			}
		}
		
		// Set idleID to 0 if all delegates are removed
		if (idleListeners.length == 0)
			idleID = 0;
		
		return runAgain;
	}

	/**
	 */

	/**
	 * Adds a function to be called whenever there are no higher priority
	 * events pending to the default main loop. The function is given the
	 * default idle priority, #G_PRIORITY_DEFAULT_IDLE.  If the function
	 * returns %FALSE it is automatically removed from the list of event
	 * sources and will not be called again.
	 *
	 * See [memory management of sources][mainloop-memory-management] for details
	 * on how to handle the return value and memory management of @data.
	 *
	 * This internally creates a main loop source using g_idle_source_new()
	 * and attaches it to the global #GMainContext using g_source_attach(), so
	 * the callback will be invoked in whichever thread is running that main
	 * context. You can do these steps manually if you need greater control or to
	 * use a custom main context.
	 *
	 * Params:
	 *     funct = function to call
	 *     data = data to pass to @function.
	 *
	 * Returns: the ID (greater than 0) of the event source.
	 */
	public static uint add(GSourceFunc funct, void* data)
	{
		return g_idle_add(funct, data);
	}

	/**
	 * Adds a function to be called whenever there are no higher priority
	 * events pending.  If the function returns %FALSE it is automatically
	 * removed from the list of event sources and will not be called again.
	 *
	 * See [memory management of sources][mainloop-memory-management] for details
	 * on how to handle the return value and memory management of @data.
	 *
	 * This internally creates a main loop source using g_idle_source_new()
	 * and attaches it to the global #GMainContext using g_source_attach(), so
	 * the callback will be invoked in whichever thread is running that main
	 * context. You can do these steps manually if you need greater control or to
	 * use a custom main context.
	 *
	 * Params:
	 *     priority = the priority of the idle source. Typically this will be in the
	 *         range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE.
	 *     funct = function to call
	 *     data = data to pass to @function
	 *     notify = function to call when the idle is removed, or %NULL
	 *
	 * Returns: the ID (greater than 0) of the event source.
	 */
	public static uint addFull(int priority, GSourceFunc funct, void* data, GDestroyNotify notify)
	{
		return g_idle_add_full(priority, funct, data, notify);
	}

	/**
	 * Removes the idle function with the given data.
	 *
	 * Params:
	 *     data = the data for the idle source's callback.
	 *
	 * Returns: %TRUE if an idle source was found and removed.
	 */
	public static bool removeByData(void* data)
	{
		return g_idle_remove_by_data(data) != 0;
	}

	/**
	 * Creates a new idle source.
	 *
	 * The source will not initially be associated with any #GMainContext
	 * and must be added to one with g_source_attach() before it will be
	 * executed. Note that the default priority for idle sources is
	 * %G_PRIORITY_DEFAULT_IDLE, as compared to other sources which
	 * have a default priority of %G_PRIORITY_DEFAULT.
	 *
	 * Returns: the newly-created idle source
	 */
	public static Source sourceNew()
	{
		auto p = g_idle_source_new();
		
		if(p is null)
		{
			return null;
		}
		
		return new Source(cast(GSource*) p, true);
	}
}